From: RappinHobo9292 | #029
I think one of the comments on the site that I read was that you can only catch them on Blue.
Not sure if this is true though.
Not true. I caught one on red. The only one you can catch is like the first one that shows up around wave 4-5ish. Its tough cause its pretty weak. the 3 that come at the end can't be caught.